Etymology

Lossarnach is glossed as "flowery Arnach".[1] While Tolkien seemed to be convinced that the second element, Arnach, was a Pre-Númenórean word, the first element caused more problems: since loss means "snow" in Sindarin it is unclear why it "was prefixed to Arnach", although it likely derived from likeness between loss and Sindarin loth ("flower").[2][1]